Buffing device in power looms



Feb. 10, 1931. TQYQDA 1,792,131

BUFFING DEVICE IN POWER LOOMS Filed Dec. 24, 1929 \7JNVENTOR. (Z10 (he W BY a 32 x A TTORNE Y.

Feb. 10, 1931 i 1 uuirs BUZEFING Device in rowna nooilis Application filed remember 24. 119 9 -gainreg mes;

7 My invention relates topower looms provided with aside lever picking motion and is more especially concerned with the picking mechanism of suchlooms, and the object 5 of my invention is to provide'a 'buffer arrangement for the picking sticks so as to assist the action of the buffer straps which at times are not suficient to check the motion ofthe: shuttle orthe stick receiving the '16 shuttle. The shuttle is'aptito move further than is desired, because of. a rebound movement of the picking stick, due to thereaction of the side'lever, which as the top of the picking stick is hit bythe shuttle, is given an upward kick by the shoe provided at the lower end of the stick. Thisocc'urs espe- .cially in looms running "at high speed.

Now, the present invention aims to cure this defect and to prevent the shuttle from being'knocked back. To this end, I provide a train of friction rollers over which passes aband or strap, one end of which is attached j to the end of thesidelevei', while the other end is attached to the rotatable'end roller equipped with a spring controlling the rotation of said roller. 7

' In the appended drawing, on which I have shown an embodiment of my invention, Fig.

his a side elevation showing a portion of the loom frame; Fig. 2 is a view at right angles thereto as seen from the right in Fig.

1; Figs. 3 and 4 show'respectively in side elevation and in plan view the train of friction rollers, drawn to a larger scale.

On the drawing, 1 lndicates a portion of the frame of a power loom; 2 is a bracketsecured to. the frame and carrying a pivot pin 3, whereby the side-lever shown at 4 is pivotally mounted on the frame. -'Said lever 1 to be engaged by a roller G'attached to the i periphery of a disc? which is secured to the 'tappet shaft 8. At'9is shown the rocking shaft on which is mounted the slay (not shown). 11 is the picking stick carrying at its lower end the shoe 10. At 12 is shown the spring controlling the picking stick.

Secured to the loom frame 1 is abracket 13, on which are provided a roller' 14 and two friction disks 15 and Y16, the roller 14 being has secured thereto a picking nose 5 adapted rotatable, I while 7 the *i 'wbdisks secured to said bracket. ".With'; rollerjl t'f cooperates KIIcnIno TGZODA, or rokvdai ren a helical spring shownjat 17, ione, end; ofgwhich' sp'ring is connected to a projection A secured to orfforined integral with-the is secured to a portion{,0f roller 14. r. To' th'e latter,there-isalso'secured at18 (Fig. 1) a band 19, theothervend of which is secured by a screw '20. to the end-of the side lever 4.v

When during the'picln'ng motion, the roller 6, on the periphery of disc 7 strikes the 552; bracket 18, whilethe'other end'offthespri'ng" nose 5, the side lever 4 is depressed with the result that the band 19 becomes slackened and is wound on roller 14 by spring'17,s1ipping over the peripheral faces of the disks :15 and.

16 to the point .fB. on bracket 13 (Fig.

when further movementis arrested by a pro.- jection C on roller 14 coming in contact with the shoulder B (Fig. 4). The side lever4,

however, still continuing its downward n0ve-' ment, the band 19 becomes slackened.

WVhen the picking mot1on1s completed,

the picking stick 11 is pulled back-by the spring 12.- 'Theshoe1O at the lower end of the picking stick, due to said back pull, being brought to bear against side lever 4 .raises thesame with the result that the slack in the band 19 istaken up again.

The shuttle now being thrown into the shuttle box (not shown) from the'other side, the picking stick receives a forceful push from its before mentioned position resulting in an upward motion of shoelO which thereby exerts an upward gkick against the side lever. 4. But the upward movement of lever 19'andthe friction disks 15 and 16, as well as by the spring 17 Gradually,"the' band 19 i is shifted'to a pointcorresponding to the position of the picking stick at its extreme end ready for picking motion. During this time,

the side lever 4 is gradually raised,in close.

contactwith the shoe so that 'allldanger of the side lever; knocking down the shoe again by its reaction is removed. 7 i The degree of friction between the band 19 and the disks 15 and 16 can be adjusted by the position of the disk 16 which as clearly shown so r 4 is checked by the friction between the band ce i in F ig. 3; is eccentricallymounted; The ten; 'sion of springll7 also adjustable.

Iclaimz r 1. In power looms havmg aside; lever picking motion, the combination with said side lever and the picking stick of a'f ric' tion member, a rotatable roller,"a band passing around said friction member in frictional engagement therewith having its one end at- I tached to said side lever and its other end to said rotatableroller, a sprlng arrangedtoroe tatesaid roller so as to exertra pull on said i band thereby producing a resistancetothe upward movement of-saidlside'lei 'er and to the picking stick when struck by a shuttle, and astop for saidrotatable rollerr 2. Thecombinati'on.aszspecified in claiml,

- in which said friction memberis eccentrically disposed to thereby adjust the friction bethe movementof said side lever.

In testimony whereof I aflix my signature.

7 KIICHIRO TOYODAe tween said band and said-rollers and thereby ir a f i 

